Find the value of \( \cos ^{-1}(-1 / 2) \). \( \mathrm{P} \) W (A) ...

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Find the value of \( \cos ^{-1}(-1 / 2) \).
\( \mathrm{P} \)
W
(A) \( \frac{\pi}{3} \)
(B) \( \frac{2 \pi}{3} \)
(C) \( \frac{\pi}{6} \)
(D) \( \pi \)
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